From a9d9c9ece2eb966537c2e3302b06896cea74bdea Mon Sep 17 00:00:00 2001
From: Pierre Olivier <pierre.olivier@manchester.ac.uk>
Date: Tue, 20 Apr 2021 09:09:07 +0100
Subject: [PATCH] fix bug when round_sz() rounds to 0

---
 src/slimguard.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/slimguard.c b/src/slimguard.c
index 1109bcd..b781b1f 100644
--- a/src/slimguard.c
+++ b/src/slimguard.c
@@ -371,6 +371,10 @@ void* xxmalloc(size_t sz) {
     uint8_t index = 255;
     need = round_sz(sz);
 
+    /* Can happen if sz is large enough */
+    if(!need)
+        return NULL;
+
     if (need >= (1 << 17)) {
         Debug("sz %lu\n", need);
         ret = xxmalloc_large(need, 0);